Sophos is reporting that hackers have taken control of Microsoft’s official YouTube channel, removed the company’s videos, and replaced them with ones of their own. There are no confirmed details yet about how the account was compromised. There is speculation as to whether or not the account was hacked or just “re-acquired”. The obvious suspicion is that a Microsoft employee who had administrative rights over the channel was careless with the password.
Beware the posted content on there for a while until things get straightened out.